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Reconciliation of Numerator and Denominator of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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May 31, 2018 | [1] | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | [2] | Aug. 31, 2016 | May 31, 2018 | May 31, 2017 | May 31, 2016
Numerator for earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to RPM International Inc. stockholders |  | $ 85,664 | $ 40,227 | $ 95,463 | $ 116,416 | $ 128,052 | $ 11,928 | $ (70,926) | $ 112,769 | $ 337,770 | $ 181,823 | $ 354,725
Less: Allocation of earnings and dividends to participating securities |  |  |  |  |  |  |  |  |  | (3,858) | (2,795) | (5,770)
Net income available to common shareholders - basic |  |  |  |  |  |  |  |  |  | 333,912 | 179,028 | 348,955
Add: Undistributed earnings reallocated to unvested shareholders |  |  |  |  |  |  |  |  |  |  | 2 |
Reverse: Allocation of earnings and dividends to participating securities |  |  |  |  |  |  |  |  |  | 3,858 |  | 5,770
Add: Income effect of contingently issuable shares |  |  |  |  |  |  |  |  |  | 5,673 | 5,457 | 5,430
Net income available to common shareholders - diluted |  |  |  |  |  |  |  |  |  | $ 343,443 | $ 184,487 | $ 360,155
Denominator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average common shares | [3] |  |  |  |  |  |  |  |  | 131,179 | 130,662 | 129,383
Average diluted options |  |  |  |  |  |  |  |  |  | 2,064 | 598 | 3,445
Net issuable common share equivalents | [4] |  |  |  |  |  |  |  |  | 3,928 | 3,905 | 3,888
Total shares for diluted earnings per share | [3],[5] |  |  |  |  |  |  |  |  | 137,171 | 135,165 | 136,716
Earnings Per Share of Common Stock Attributable to RPM International Inc. Stockholders: |  |  |  |  |  |  |  |  |  |  |  |
Basic Earnings Per Share of Common Stock |  | $ 0.65 | $ 0.30 | $ 0.72 | $ 0.87 | $ 0.96 | $ 0.09 | $ (0.54) | $ 0.85 | $ 2.55 | $ 1.37 | $ 2.70
Diluted Earnings Per Share of Common Stock |  | $ 0.63 | $ 0.30 | $ 0.70 | $ 0.86 | $ 0.94 | $ 0.09 | $ (0.54) | $ 0.83 | $ 2.50 | $ 1.36 | $ 2.63
[1] | Reflects inventory-related charges of $36.5 million in our consumer reportable segment for product line rationalization and related obsolete inventory identification and $1.2 million in inventory reductions related to restructuring activities in our industrial reportable segment. Additional restructuring charges totaling $17.5 million were incurred during the fourth quarter of fiscal 2018, as further described in Note B, “Restructuring.” We also incurred charges in our industrial segment totaling $4.2 million in connection with the decision to exit Flowcrete China.
[2] | Reflects the pretax goodwill and intangible asset impairment losses of $188.3 million related to our Kirker reporting unit. Refer to Note C, “Goodwill and Other Intangible Assets,” for further information. Also reflects $12.3 million pretax charge relating to the Flowcrete decision to exit the Middle East and $15.0 million in severance expense across all three reportable segments.
[3] | Basic and diluted earnings per share are calculated using the two-class method for the year ended May 31, 2017. For the years ended May 31, 2018 and 2016, basic and diluted earnings per share are calculated under the two-class method and the treasury method, respectively, as those methods resulted in the most dilutive earnings per share.
[4] | Represents the number of shares that would be issued if our contingently convertible notes were converted. We include these shares in the calculation of diluted EPS as the conversion of the notes may be settled, at our election, in cash, shares of our common stock, or a combination of cash and shares of our common stock.
[5] | For the years ended May 31, 2018 and 2017, approximately 799,362 and 606,048 shares of stock, respectively, granted under stock-based compensation plans were excluded from the calculation of diluted EPS, as the effect would have been anti-dilutive.

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